secondary air inlet pipe

例句：

1. 1.The secondary air inlet pipe is designed to improve the efficiency of the engine.
   二次空气进口管的设计旨在提高发动机的效率。
2. 2. The engineer carefully inspected the secondary air inlet pipe before starting the engine.
   工程师在启动发动机前仔细检查了二次空气进口管。
3. 3.During the test, the secondary air inlet pipe was found to have a significant impact on the performance of the engine.
   测试期间，发现二次空气进口管对发动机的性能有显著影响。